What are you using in Linux to move the plots to another device?

You need to look at all factors:

  1. Max network throughput
  2. Bus speed of target drive
  3. Target drive write speed
  4. SSH overhead

Use iperf3 to verify throughput.
USB 2.0 max. is about 40 MB/s. How is the drive connected?
What is the brand/model of the drive?
NFS, for example, will likely be faster than SSH.

You’ll need to answer those questions and dig up the specs.

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